<template>
  <div :class="className" :style="{height:height,width:width}"/>
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '350px'
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null,
      sidebarElm: null
    }
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val)
      }
    }
  },
  mounted() {
    this.initChart()
    if (this.autoResize) {
      this.__resizeHandler = debounce(() => {
        if (this.chart) {
          this.chart.resize()
        }
      }, 100)
      window.addEventListener('resize', this.__resizeHandler)
    }
    // 监听侧边栏的变化
    this.sidebarElm = document.getElementsByClassName('sidebar-container')[0]
    this.sidebarElm && this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
  },
  // activated() {
  //   // 由于给echart添加了resize事件, 在组件激活时需要重新resize绘画一次, 否则出现空白bug
  //   if(this.xAxis_data) {
  //     this.exchang_numData.resize()
  //     this.sale_after_numData.resize()
  //     this.trading_amountData.resize()
  //     this.user_numData.resize()
  //     this.xAxis_data.resize()
  //   }
  // },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    if (this.autoResize) {
      window.removeEventListener('resize', this.__resizeHandler)
    }

    this.sidebarElm && this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)

    this.chart.dispose()
    this.chart = null
  },
  methods: {
    sidebarResizeHandler(e) {
      if (e.propertyName === 'width') {
        this.__resizeHandler()
      }
    },
    setOptions({ exchang_numData, sale_after_numData, trading_amountData, user_numData, xAxis_data } = {}) {
      this.chart.setOption({
        xAxis: {
          data: xAxis_data,
          boundaryGap: false,
          axisTick: {
            show: false
          }
        },
        grid: {
          left: 10,
          right: 10,
          bottom: 20,
          top: 30,
          containLabel: true
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross'
          },
          padding: [5, 10]
        },
        yAxis: {
          axisTick: {
            show: false
          }
        },
        legend: {
          data: ['订单成交量', '售后订单量', '交易总额', '用户访问量']
        },
        series: [{
          name: '订单成交量', itemStyle: {
            normal: {
              color: '#FF005A',
              lineStyle: {
                color: '#FF005A',
                width: 2
              }
            }
          },
          smooth: true,
          type: 'line',
          data: exchang_numData,
          animationDuration: 2800,
          animationEasing: 'cubicInOut'
        },
        {
          name: '售后订单量',
          smooth: true,
          type: 'line',
          itemStyle: {
            normal: {
              color: '#3888fa',
              lineStyle: {
                color: '#3888fa',
                width: 2
              },
              areaStyle: {
                color: '#f3f8ff'
              }
            }
          },
          data: sale_after_numData,
          animationDuration: 2800,
          animationEasing: 'quadraticOut'
        },
        {
          name: '交易总额', itemStyle: {
            normal: {
              color: '#ff0000',
              lineStyle: {
                color: '#ff0000',
                width: 2
              }
            }
          }, smooth: true,
          type: 'line',
          data: trading_amountData,
          animationDuration: 2800,
          animationEasing: 'cubicInOut'
        },
        {
          name: '用户访问量', itemStyle: {
            normal: {
              color: '#9f5f9f',
              lineStyle: {
                color: '#9f5f9f',
                width: 2
              }
            }
          }, smooth: true,
          type: 'line',
          data: user_numData,
          animationDuration: 2800,
          animationEasing: 'cubicInOut'
        }]
      })
    },
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      this.setOptions(this.chartData)
    }
  }
}
</script>
